Crop yield response to water - Cra

A major advantage of the canopy temperature techniques is the possibility of acquiring thermalimages that represent complete orchards from aerial vehicles or satellites. This allows an entirefield to be characterized rather than monitoring only a few points or trees, as is now the case withsoil and plant-based techniques. Additionally, analysing the tree-to-tree variability of remotelysensed canopy temperature data may produce other indicators of orchard water needs. Box 13shows maps of CWSI for an orchard and the degree of detail that can be obtained from thermalimages that have sufficient resolution to map each tree crown with detail.box 13 Thermal orthomosaic obtained from the UAV over the peach orchard at 40-cm resolution.The zoomed image on the top shows the water stressed trees (warmer, in red and yellow) ascompared with the fully irrigated trees (blue). The bottom right image shows a low-altitudeimage where within-crown thermal variability is observed (adapted from Berni et al., 2009).278crop yield response to water